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fix: resolve database deadlock: #4989

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merged 4 commits into from
Apr 18, 2024
Merged

fix: resolve database deadlock: #4989

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76ee8d6
fix: resolve database deadlock:
seelabs Apr 12, 2024
d7ff96d
Merge branch 'develop' into db-deadlock
ximinez Apr 18, 2024
3f908fa
Merge branch 'develop' into db-deadlock
ximinez Apr 18, 2024
e6e26d4
Merge branch 'develop' into db-deadlock
ximinez Apr 18, 2024
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10 changes: 9 additions & 1 deletion src/ripple/nodestore/impl/DatabaseRotatingImp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@

#include <ripple/nodestore/DatabaseRotating.h>

#include <mutex>

namespace ripple {
namespace NodeStore {

Expand Down Expand Up @@ -82,7 +84,13 @@ class DatabaseRotatingImp : public DatabaseRotating
private:
std::shared_ptr<Backend> writableBackend_;
std::shared_ptr<Backend> archiveBackend_;
mutable std::mutex mutex_;
// This needs to be a recursive mutex because callbacks in `rotateWithLock`
// can call function that also lock the mutex. A current example of this is
// a callback from SHAMapStoreImp, which calls `clearCaches`. This
// `clearCaches` call eventually calls `fetchNodeObject` which tries to
// relock the mutex. It would be desirable to rewrite the code so the lock
// was not held during a callback.
mutable std::recursive_mutex mutex_;

std::shared_ptr<NodeObject>
fetchNodeObject(
Expand Down